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8000 =s³
s=∛8000
s=20 cm
Lp kubus tanpa tutup=5×s
=5×20
=100 cm²
kurangi luas tutup atas 20*20 = 400
artinya
20*20 = 400 (1 sisi permukaan)
ada 5 sisi permukaan (1 sisi tutup dihilangkan)
400*5= 2000 cm2